Trip-coil-adjusting means.



C. D. AINSWORTH.

TRIP COIL ADJUSTING MEANS.`

APPLICATION FILID IAN. 4, 1918.

zy' /24' j?? `l f'/ 1,/ ..I V m um l #-5 "'L z i I g -I t I I I I, l I iI I I I i I I I I l I fa I I g 'I /0 I I l I I l l I I l I I I I I l l II Ii I l l I l l Il /f I 1 i I I I I I I 5 'lllllllllrlrllnvlnl 3 /4 /4/3 "I /5 f /J /I M /7\ i /7 I; /f

MQW

ms nanna uns om pmmmunm, wnmonw, n. c

UNITED STATES T OFFICE.l

CHESTER D. AINSWORTIL, 0F WOLLASTON, MASSACHUSETTS, ASSIGNOR CONDIT,JR., 0F BOSTON, MASSACHUSETTS.

To SEARS B.

TRIP-COIL-ADJUSTING MEANS.

Specication of Letters Patent.

Patented Jan. 14, 1919.

Application filed January 4, 1918. Serial No. 210,393.

To all whom t may concern.'

Be it known that I, CHESTER D. AINS- woRTH, a citizen of the vUnitedStates, and a resident of Wollaston, county of Norfolk, and State ofMassachusetts, have invented an Improvement in Trip-Coil-AdjustingMeans, of which the following is a specication.

My invention relates to overload or trip coils associated with electricswitches designed for the lcontrol of multi-phase circuits, and has moreespecial referenceA to the ca llbrating or adjusting means for such tripco1 s.

In practice, it is customary to associate with an oil switch for the useAabove specified, a plurality of overload coils, each having anindependently movable element, adapted upon the suficient energizationof said coil, to operate to causethe opening of the switch.

kIt has heretofore been customary to independently adjust each overloadcoil for the predetermined current How at which it is desired tooperate.

When the trip coils are arranged for independent adjustment, it isextremely dificult to adjust the coils for substantially simultaneousoperation upon an equal predetermined current Yflow Yin allcoils, andconsequently there is 'a' possibility of there being one coil in theswitch which will trip before the other, which is undesirable. 1' i Anobject of my invention is to provide a single means associated with aplurality of trip coils by the adjustment of which the entire number oftrip coils may be simultaneously adjusted fora predetermined c'urrentflow.

The means whereby I accomplish this object of my invention is theprovision of a strip or rod arranged beneath the movable elements of allof said trip coils and upon which said elements normally rest. Y

Said strip or rod is secured to an-adjusting member, which may bearranged to be adjustably secured to a support, whereby said strip orrod maybe moved tovary the position ofthe movable elements'of all thecoils within the coils to .thereby simultaneously and equally adjust thecoils for operation'upon a certain currentfflow through said coils. Thesupport-for the adjusting member may be calibratedand the adjustingmember may bear a witness mark to indicate on the calibration scale thecurrent value for which allof the overload coils are" adjusted tooperate.

The overload or trip coils associated with an oil switch designed forthe protection of multi-phase circuits are frequently arranged withinthe switch inclosing casing, and may be entirely or partially submergedin the oil contained therein. With such an arrangement it is difficulttovadjust the trip coils, as they'are ordinarily constructed.l

A second object of my invention is therefore in the provision of anoverload or trip coil adjusting means whereby adjustmentsv to the coilsmay be made from above the surface of the oil and in a part of theswitch casing that is easily accessible.

The means whereby I attain this object of my invention is in thearrangement of a por! tion of the adjusting memberof the coils above theswitch supporting base ror housing in the casing, whereby access totheadjust# ing member may be easily obtained by the removal of the switchcover.

Figure 1 is a front elevation of the coils and adjusting means therefor.

Fig. 2 is a rear view of the apparatus of Fig.1. l

Fig. 3 is a side view of the apparatus of trip Fig. 1. Figli is a topview ofthe apparatus of Fig. 1. v As here shown, a plurality of trip'coils or solenoids l0 are secured to and suspended from a frame 11,which is secured to the walls of the switch casing. Said coils orsolenoids 10 depend into the oil contained in the switch casing, and arearranged to'be partially immersed therein. `The frame 11 is formed witha depending portion 12 and a bottom portion 13, which is provided withopenings 14 therein through which the mov able elements or cores15 ofthe solenoids are disposed. The supporting frame `-thereby forms amagnetic path for the flux of the solenoids, whereby the eiiiciency ofsaid` solenoids is increased. l .l

The cores 15 are provided with stems. or extensions 16 dependingtherefrom at the ends of which the strikingdisks 17 are secured by meansof the screws 1 8.

The means whereby the solenoidsmay be equally and. simultaneouslyadjusted for opsolenoids. As the cores 15, through thin stems orextensions 16 are normally in contact with the rod or strip 19, it isseenthat a movement of said rod or strip in a vertical plane serves tomove all of said cores n equally and simultaneously in a vertical plane,to thereby vary the adjustment or calibration of the solenoids.

'The adjusting member 20, to the end ofY which the rod or stripf19 issecured, and which may be formed of a single strip of material, isdisposed to one side of the solenoids and extends vertically upwardthrough slots 21 in the frame supporting the solenoids, and terminatesat a point above said frame. Said slots 21 serve as guides to permitsaid adjusting members to be moved in a substantially vertical plane tocorrespondingly adjust the solenoids and maintain said adjusting memberin alinement in any adjusted position. Y

A standard 24 is secured to the top member 12 of the solenoid supportingframe and is arranged adjacent the top portion of the adjusting member,and said adjusting member is adapted to be moved over the Yface of saidstandard in an adjustment of said member.

Said standard 24 is formed with a slot 23 therein, in which the bolt ofa wing nut 22, is disposed. Said bolt is secured to the top portion ofthe adjusting member and forms means, in conjunction with the standard24, whereby the adjusting member may be clamped in any adjustedposition.

Vto

Inasmuch as the end of the adjusting member extends above the solenoids,it is above the surface of the oil in which the solenoids are adapted tobe either partially or entirely immersed, so that changesY ofcalibration for the solenoids may bereasily and conveniently made. Y

The face of said standard 24 maybe formed with a scale 25, which may becalibrated in amperes, and the topV edge 26 of the adjusting member maybe employed as a witness mark which, in conjunction with the scale onsaid standard, serves toindicate the value of current at which all ofsaid coils are adjusted to operate.

I claim:

1. In combination with a plurality of'trip coils for electricswitc'hes,of a single meansV arranged to simultaneously adjust said for adetermined current flow.

2. In combination with a plurality of trip coils, of a single meansarranged to simultaneously adjust theV movable elements of coils saidcoils for a determinate current flow, said means extending above thesurface of oil within said switch.

3. In combination with a plurality of trip coils forl electric switches,of means in normal engagement with all of the movable elements of saidcoils, whereby a Vmovement of said means causes a corresponding movementof said elements. Y

4. In combination with a plurality of trip coils for electric switches,of a single means in normal engagement with all of the movable elementsof said coils, whereby a movement of said means causes a correspondingmovement of said elements.

5. In combination with a plurality of trip coils for electric switches,of a rod extended beneath all of the movable elements of said coils andwith which said movable elements are in normalV engagement, andadjusting means for said rod.

6. In combination with a plurality oftrip coils for electric switches,of a rod extended beneath all of the movable elements of said coils andwith which said movable elements are in normal engagement, adjustingmeans for said rod whereby said coils are adjusted for a determinatecurrent flow, and means to indicate the adjustment.

7. In combination, a plurality of trip coils,

a supporting frame therefor, movable elements arranged within saidcoils, a rod arranged beneath all of said movable elements and withwhich said elements are in normal engagement, an arm secured to said rodand slidably arranged to said supporting frame and means to secure saidarm and rod in adjusted position to said frame.

8. In combination, a plurality of trip coils, a supporting frametherefor, movable elements arranged within said coils, a` rod arrangedbeneath all of said movable elements and with which said elements are innormal engagement, an arm secured to said rod and slidably arranged tosaid supporting frame, a standard arranged on said frame and with whichsaid arm is in sliding engagement, and means whereby said arm is securedin adjusted'position to said standard.

Y9. In combination, a plurality of trip coils,

ments arranged within said coils, a rod arranged beneath all of saidmovable elements i and with which said elements are in normalengagement, `an arm secured to said rod and slidably arranged in saidsupporting frame, a standard arrangedon said frame and with which saidarm is in sliding engagement, means for indicating the currentadjustment of said trip coils, and means whereby said arm is securedinadjusted position to said standard. A

10. In combination, a plurality of trip coils, a supporting frametherefor, movable' elements arranged within said coils, a rod arrangedbeneath all of said movable elejustment of said coils, and clampingmeans 10 ments and with which said elements are in for said arm.

normal engagement, an arm secured to said In testimony whereof I havesigned my rod and slidably arranged in said supportname to thisspecification in the presence of ing frame, a standard arranged on saidtwo subscribing Witnesses.

frame and With which said arm is in sliding CHESTER D. AINSWORTH.engagement, a calibration scale on said Witnesses:

standard operating, in conjunction with the GORDON CAMERON,

end of said arm, to indicate the current ad- T. T. GREENWOOD.

Copies at this patent may be obtained for ve cents each, by addressingthe "Commissioner of latenti, Washington, D. 0.

